JPH07284601A - Solvent vapor generator - Google Patents

Abstract

PURPOSE:To provide a solvent vapor generator capable of preheating a solvent, rapidly vaporizing the solvent after the solvent is brought into contact with a heating element, increasing the amt. of vapor to be generated per unit area and efficiently generating the vapor with the small-area heating element. CONSTITUTION:A heat-resistant liq. holding member 3 is fixed on the outer periphery of a heating element 4 capable of heating a solvent to a temp. where the solvent is vaporized to constitute a vaporization main body 2. The main body 2 is fixed in a solvent vaporizer 1 so that the solvent flows down on the surface. A solvent inlet 8 is arranged and confronted with the upper edge of the main body 2.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention can be used for distillation regeneration of a polluted solvent used for immersion cleaning, shower cleaning and the like. Further, even a clean solvent which is not polluted can be used as a vapor generation source when the object to be cleaned is vapor-cleaned by vaporizing it. In addition, the objects to be cleaned in this case include electronic parts, mechanical parts, medical devices, and various other objects.

[0002]

2. Description of the Related Art Conventionally, as a method for heating such a solvent liquid to generate steam, a solvent is filled in a vapor generating layer and stored, and a heat source such as a heater is added to the stored solvent. Contact. Then, a method is known in which the solvent in the vapor generation layer is continuously heated to bring it to a boil, thereby vaporizing the solvent.

In this method, since the solvent is continuously heated and evaporated while boiling, the solvent is kept at a high temperature for evaporation. Due to this effect, if the solvent contains a component that easily causes thermal decomposition, the thermal decomposition causes a decomposed gas. This decomposition gas
In many cases, corrosive gas such as hydrochloric acid gas or chlorine gas is generated, which not only adversely affects the environment but also accelerates corrosion of the steam generator and shortens the life of the device.

Particularly, when the solvent is a pollutant solvent used after cleaning the object to be cleaned, processing oil is attached to the object to be cleaned during machining. When chlorinated paraffin, sulfur, etc. are mixed in this processing oil, the chlorinated paraffin, sulfur, etc. will dissolve in the washed solvent. In many cases, a corrosive gas is generated by repeatedly and continuously heating the solvent in which the chlorinated paraffin, sulfur, etc. are mixed.

Therefore, as one developed for the purpose of preventing the generation of these corrosive gases, a heating element for heating and evaporating a solvent is formed in a sheet shape, and the solvent is formed on the surface of the sheet heating element. Conventionally, there is known a technique in which a solvent is allowed to flow down on the surface of a heating element by bringing them into contact with each other to evaporate the solvent in the process of this flow.

In this method, the solvent is not heated repeatedly and continuously, but the solvent is heated only in the process in which the solvent comes into contact with the heating element and flows down. Therefore, there is an advantage that no corrosive gas such as chlorine gas or hydrochloric acid gas is generated by repeatedly heating the solvent as described above.

[0007]

However, in the above-mentioned conventional example, since the solvent only contacts the planar heating element, the contact time between the heating element and the solvent is extremely short, and most of the solvent evaporates. Instead, it has the drawback of being discarded as waste liquid. In addition, since the contact time between the solvent and the heating element is short in the planar heating element, the amount of solvent vapor generated is small, and if a large amount of vapor is required, increase the evaporation area of the heating element. However, it has a drawback that the efficiency for obtaining steam is low and the apparatus becomes large in size and expensive.

The present invention solves the above problems, does not cause thermal decomposition in the vapor generation of a solvent, does not generate chlorine gas or hydrochloric acid gas, and has a large amount of vapor due to a small heating element. Is efficiently generated.

[0009]

In order to solve the above-mentioned problems, the present invention has a heat-resistant liquid-retaining material fixed to the outer periphery of a heating element capable of heating to a temperature at which the solvent can be evaporated. A main body is formed, the evaporation main body is fixed in a solvent evaporator so that the surface of the solvent can flow down, and a solvent supply port is arranged so as to face the upper end of the evaporation main body.

The liquid retaining material may be formed by fixing cotton fibers on the surface of the heating element.

The liquid retaining material may be formed by fixing glass fibers on the surface of the heating element.

The liquid retaining material may be formed by fixing metal fibers on the surface of the heating element.

Further, the solvent evaporator may be one in which a storage portion for the waste liquid which could not be evaporated while being in contact with the heating element is provided on the lower bottom.

The solvent evaporator may be connected to a vacuum pump so that the inside of the solvent evaporator is in a depressurized state.

Further, the evaporation main body may be formed in a planar shape and arranged vertically in the center of the solvent evaporator.

The evaporation body may be formed in a cylindrical shape and arranged on the inner peripheral surface of the solvent evaporator.

Further, the evaporation main body may be formed by bending a tubular heating element into a bellows shape or a spiral shape and fixing a liquid retaining material to the outer periphery of the heating element.

[0018]

Since the present invention is constructed as described above,
When diluting and regenerating the polluted solvent, or when vaporizing a normal solvent and using it for steam cleaning, supply the solvent from the supply port facing the upper part of the evaporation main body and make it contact the heating element of the evaporation main body. . The supplied solvent comes into contact with the liquid retaining material fixed on the surface of the heating element. Therefore, the solvent does not pass through the surface of the heating element at a high speed as in the conventional case, and is retained by the liquid retaining material and can be heated by the heating element for a relatively long time.

The above-mentioned heating by the heating element for a relatively long time means that the solvent directly contacting the heating element is heated up to the evaporation temperature by the heating element, but is retained in the liquid retaining material and held in contact with the heating element. The solvent that is not heated is not heated to the evaporation temperature and is preheated by the heating element.
When it comes into contact with a heating element, it can immediately evaporate. Therefore, the solvent held in the liquid-retaining material for a certain period of time is preheated sufficiently and can be rapidly and efficiently vaporized by contact with the heating element, reducing the amount treated as waste liquid and reducing the area of the heating element. Even if is small, it is possible to generate a sufficient amount of steam.

Also, the solvent does not reach a temperature that causes thermal decomposition in the preheating stage. Further, even if the solvent comes into contact with the heating element, as in the conventional case, the heating element is not immersed in the solvent to continuously and repeatedly heat the solvent, so that a corrosive gas such as hydrochloric acid gas or chlorine gas is generated. There is no such thing.

Further, as compared with the conventional example in which a solvent is simply contacted with the surface of the heating portion, a large amount of solvent can be retained on the surface of the heating element for a relatively long time due to the formation of the liquid retaining material. By preheating, a large amount of efficient steam can be generated. Moreover, since the solvent before being evaporated can be preheated by allowing the solvent to stay, the solvent can contact the heating element and evaporate in a short time, and the heating portion for generating steam can be made small, and a small apparatus With this, a large amount of steam can be produced and generated at low cost.

If the liquid retaining material is formed by fixing cotton fibers on the surface of the heating element, more solvent can be retained on the surface of the heating element due to the inexpensive material, and efficient vapor generation can be achieved. Is possible.

Further, if the glass fibers are formed by being fixed on the surface of the heating element, the liquid retaining material is prevented from being corroded by the solvent and can be used for a long period of time. It becomes possible to retain the solvent and retain it.

Further, if the liquid retaining material is made of metal fibers, the heat conduction from the heating element will be good, and efficient evaporation of the solvent will be possible.

Further, if a waste liquid storage portion that cannot be evaporated while being in contact with the heating element is provided at the lower end of the solvent evaporator, the mechanism of the solvent evaporator can be simplified and the waste liquid treatment can be facilitated.

Further, if the solvent evaporator is connected to a vacuum pump and the inside is depressurized, steam can be generated at a temperature lower than the boiling point originally possessed by the solvent, and the temperature of this steam generation is lowered. As a result, it is possible to further reduce the generation of thermal decomposition gas of chlorine gas or hydrochloric acid gas. Further, when cleaning a product that is easily deformed by heat, such as a resin cleaning target, by steam cleaning, it is possible to perform steam cleaning at a low temperature.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. (1) is a solvent evaporator in which an evaporation main body (2) is fixedly formed in the vertical direction of a central portion. . This evaporation body (2)
It is composed of a heat-resistant liquid retaining material (3) and a planar heating element (4).

The flat heating element (4) is constructed so that the solvent to be supplied can be heated to a temperature at which it can be evaporated. An electric heater or the like may be used for this heating, or a distribution pipe (not shown) is provided inside, and one end of this distribution pipe is connected to an inlet (5) for heating liquid, superheated steam, or the like. At the other end, an outlet (6) for these heating liquid or superheated steam is connected.

The flat heating element (4) has a liquid retaining material (3) fixed to the outer periphery thereof to form an evaporation main body (2). The liquid retaining material (3) is not particularly limited as long as it can withstand the heat generated by the heating element (4) and can temporarily retain the solvent. In this case, cotton fiber or glass fiber may be used.
It is also possible to use metal fibers.

The liquid retaining material (3) is fixed on the surface of the heating element (4). In the case of cotton fiber, the fixing method is performed by winding it around the surface of the heating element (4). It's easy. The liquid retaining material (3) may be fixed to the surface of the heating element (4) with an epoxy resin, an adhesive or the like. Furthermore, a heating element may be provided by using an appropriate jig or the like.
You may use the method of fixing on the surface of (4).

A solvent introducing pipe (7) for introducing a solvent is located so as to face the upper surface of the evaporation main body (2), and the upper end of the evaporation main body (2) is placed on the lower surface of the solvent introduction pipe (7). To form a solvent supply port (8). The solvent supplied and dropped from the supply port (8) is received by a liquid receiving part (10) formed in an inverted V shape at the upper end of the evaporation main body (2), and sequentially accumulated while retaining in the liquid retaining material (3). Flows downward.

Further, at the bottom of the solvent evaporator (1) is stored a waste liquid (9) that contains the solvent, water, impurities such as filth which have not been evaporated even when they contact the evaporation body (2). It forms part (11). In addition, the waste liquid (9) is stored in the reservoir (11).
A drainage drain (12) for draining the liquid is formed. Further, the solvent evaporator (1) forms a steam outlet (13) for guiding the generated steam to a steam cleaning tank or the like. Further, the solvent evaporator (1) has a vacuum pipe (15) connected to a vacuum pump (14) or the like for reducing the pressure inside thereof, and an opening / closing valve (1).
It is connected via 6).

In the above-mentioned structure, in order to regenerate the waste solvent by distillation and to heat the ordinary solvent to generate steam, the solvent introduction pipe (7) is supplied through the supply port (8). To supply the solvent to the evaporation body (2).

The solvent supplied from the supply port (8) is received by the liquid receiving portion (10) of the heating element (4), and then the surface of the flat heating element (4) is covered with a liquid retaining material. It flows downward while being retained and retained by (3). Since this solvent is retained and retained by the liquid retaining material (3) such as cotton fiber, glass fiber, metal fiber, etc., the liquid retaining solvent before contact with the heating element (4) is preheated and the heating element ( Since it evaporates in a short time when coming into contact with 4), a large amount of vapor can be efficiently generated even if the area of the heating element 4 is small.

Then, the solvent, water, filth, etc. which have not been evaporated are stored as a waste liquid (9) in a storage portion (11) provided at the lower end of the solvent evaporator (1). The waste liquid (9) stored in the solvent is used as a contaminant for the water, processing oils such as chlorinated paraffin and sulfur, and other substances to be cleaned and used for cleaning. Most of the substances mixed in the solvent are introduced as waste liquid (9) into the storage part (11). Then, most of the solvent is recovered as vapor from the vapor outlet (13) by heating the heating element (4).

Further, the solvent is not heated continuously and repeatedly as in the conventional case, and does not undergo thermal decomposition during the preheating which is in contact with the liquid retaining material (3), so that the solvent and the heating element (4) are not heated. Since vaporization can be carried out in a short time after the contact, the temperature does not rise above the set temperature, thermal decomposition does not occur due to heating for a long time, and no corrosive gas such as chlorine gas or hydrochloric acid gas is generated. Therefore, the solvent vaporizer (1) and other components do not corrode the object to be cleaned by being mixed in the vaporized vapor.

In the above embodiment, the evaporation body
(2) was formed in a flat shape as shown in FIGS. 1 and 2, and was formed in the central portion of the solvent evaporator (1) in the vertical direction. However, in a different embodiment, as shown in FIG. 3, the solvent evaporator (1)
It is also possible to form an annular shape on the inner peripheral surface of the. By forming in this way, the evaporation main body can be formed in a larger area than the above embodiment without changing the size of the solvent evaporator (1).
(2) can be formed, and more efficient steam can be generated.

In another different embodiment, the evaporation body
In (2), the tubular heating element (4) is bent into a bellows shape as shown in FIG. 4, and the liquid retaining material (3) is fixed to the outer periphery of the heating element (4). In a further different embodiment, the tubular heating element (4) may be formed in a spiral shape.

[0039]

Since the present invention is configured as described above, in a vapor generator for evaporating a solvent while flowing down the surface of a heating element, the solvent is preheated and a rapid heating is performed after contact with the heating element. It is possible to perform various kinds of evaporation and increase the amount of solvent generated per unit time. Therefore, a large amount of solvent can be evaporated with a heating element having a small area, and efficient vapor generation is possible.

Further, since the solvent is not continuously and repeatedly heated, there is no generation of a corrosive gas due to thermal decomposition which has been conventionally generated, and the steam generator, the object to be cleaned, etc. may be contaminated with the corrosive gas. There is no such thing.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a left side surface of FIG.

FIG. 3 is a cross-sectional view showing a different embodiment, in which the evaporation main body is formed on the inner peripheral surface of the solvent evaporator.

FIG. 4 is a cross-sectional view showing another example of the evaporation main body formed in a bellows shape.

[Explanation of symbols]

 (1) Solvent evaporator (2) Evaporating body (3) Liquid retaining material (4) Heating element (8) Supply port (9) Waste liquid (11) Reservoir (14) Vacuum pump

Claims (9)

[Claims] 1. A heat-resistant liquid-retaining material is fixed to the outer periphery of a heating element capable of heating to a temperature at which a solvent can be evaporated to form an evaporation main body, and the evaporation main body is placed inside a solvent evaporator. A solvent vapor generator characterized in that the solvent is fixed so that it can flow down, and the solvent supply port is arranged so as to face the upper end of the evaporation main body. 2. The liquid retaining material is formed by fixing cotton fibers on the surface of a heating element.
Solvent vapor generator. 3. The solvent vapor generator according to claim 1, wherein the liquid retaining material is formed by fixing glass fibers to the surface of the heating element. 4. The solvent vapor generator according to claim 1, wherein the liquid retaining material is formed by fixing metal fibers on the surface of the heating element. 5. The solvent vapor generator according to claim 1, wherein the solvent evaporator is provided with a storage portion for storing the waste liquid which cannot be evaporated while being in contact with the heating element, on the lower bottom. 6. The solvent vapor generator according to claim 1, wherein the solvent evaporator is connected to a vacuum pump to bring the inside into a depressurized state. 7. The solvent vapor generator according to claim 1, wherein the evaporation main body is formed in a flat shape and arranged vertically in the center of the solvent evaporator. 8. The evaporation main body is formed in a cylindrical shape and is arranged on the inner peripheral surface of the solvent evaporator.
Solvent vapor generator. 9. The solvent vapor according to claim 1, wherein the evaporation main body is formed by bending a tubular heating element into a bellows shape or a spiral shape, and fixing a liquid retaining material on the outer periphery of the heating element. Generator.